The Burgtec Oval ThickThin Cinch RF Chainring comes after a full year of testing to ensure the quality of this chainring. Through research and testing of many different prototypes with varying amounts of Ovality we found 115% (from the top centre) to be the optimum. This shrank the dead spot suitably and gave the same flawless chain retention and silence as our round rings.  The shortening of the dead spot on the top and bottom of the power curve allows you to get back into the power phase of your crank rotation sooner. Burgtec Oval ThickThin Cinch RF Chainring Features Thick Thin Tooth profile with Mud Bleed 10 11 and 12 Speed Compatible 115 Degree’s of Ovality Fully CNC Machined from 7075 Aluminium